This report is the first exhaustive [and exhausting] independent
analysis of LTE TDD for public consumption. Over a four day period in
late August, we conducted a drive test of Softbank's (News - Alert) LTE TDD and LTE FDD
networks in the greater Tokyo region. In addition to comparing the two
LTE duplex schemes while doing lengthy downlink and uplink throughput
tests in a mobile environment - we transferred 124.2 GB just on the LTE (News - Alert)
TDD network during these tests - we also looked at te performance of
the two duplex schemes with more typical applications.

This effort would not have been possible without the support of Accuver,
who provided us with access to its XCAL data collection tool and its
XCAP post-processing software. We have used the solution numerous times
over the last several years so we are very accustomed to using it,
although we do stumble upon new capabilities and features each time we
use it. In our most recent benchmark studies, specifically LTE TDD in
Tokyo and LTE Advanced Carrier Aggregation in Seoul, the solution's
ability to support recently introduced technology features, including
Category 4 chip sets and Carrier Aggregation, proved to be invaluable.

This drive test campaign was entirely self-sponsored although we did
receive logistical support in the form of test SIMs, a high bandwidth
server, and mobile devices. SRG assumes full responsibility for the
analysis and commentary included in this report.